I don’t know where you are getting 9.4 for WWII. The chart says 66 million.
I don’t see the 66 for WWII. The 9.4 per year is listed in the box at the very bottom of the chart.
9.4 is the number of millions of WWII deaths PER YEAR in the data block, lower left.
66 is the TOTAL number of WWII deaths (on multiple continents) in the Deaths from International Wars section at the top.
According to The New York Times, murdering muslims don't count, nor do murdered Jews.
No bias here...